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[Denilson Sá <denilsonsa@xxxxxxxxx>]

I have an Asus X450CA laptop and I had the same issue.

I solved by following these steps:

1. Install "alsa-tools-gui" package.
2. Run hdajackretask.
3. Check ☑ Show unconnected pins.
4. At pin 0x18, check ☑ Override and select Microphone from the list.
5. Click "Apply now" to test if it works.
6. Click "Install boot override" to make it definitive.

In my case, it was pin 0x18. I don't know if the pin is different for
other laptops.

See also:
* Screencast of this solution: https://youtu.be/yx33W-c4Cmg
* alsa-info.sh output: http://www.alsa-project.org/db/?f=3fca8420153cf1b5424b490cf0d58f65224c27c1
* A most likely duplicate bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1359803

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https://bugs.launchpad.net/bugs/1382642

Title:
  Mic not working for ubuntu 14.04 in asus X550LC

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I am having a dual boot system with windows 8.1 and ubuntu 14.04. One
  thing i noticed peculiar is that the microphone works for a single
  time in ubuntu when the laptop is restarted from the windows os

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  albince    1922 F.... pulseaudio
   /dev/snd/controlC0:  albince    1922 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Oct 17 23:46:09 2014
  HibernationDevice: RESUME=UUID=0566a2b7-98c1-4c1c-b8c8-214bc955a153
  InstallationDate: Installed on 2014-07-01 (108 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Lsusb:
   Bus 001 Device 002: ID 8087:8000 Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 002 Device 002: ID 04f2:b40a Chicony Electronics Co., Ltd 
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X550LC
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic root=UUID=92d60a28-1426-4cda-a1e7-17e9f7037dc6 ro elevator=deadline quiet splash acpi_osi=
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-30-generic N/A
   linux-backports-modules-3.13.0-30-generic  N/A
   linux-firmware                             1.127.7
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/27/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X550LC.403
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X550LC
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550LC.403:bd06/27/2014:svnASUSTeKCOMPUTERINC.:pnX550LC:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550LC:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X550LC
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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